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Hong, Yong Cheol,Ma, Suk Hwal,Kim, Kangil,Shin, Yong Wook Elsevier 2019 Chemical engineering journal Vol.374 No.-
<P><B>Abstract</B></P> <P>To make aquaculture more environmentally and economically sustainable, novel water treatment technologies are urgently required. Therefore, in this study, a novel multihole dielectric barrier discharge (MH-DBD) plasma system submerged in water was investigated to sterilize aquaculture pathogens. The plumes from the DBD plasma directly contact water through multiple holes installed on an outer dielectric of an asymmetric coaxial DBD. The MH-DBD plasma in <I>Vibrio harveyi</I> sterilization showed inactivation performance higher than 2 log reduction, compared to coaxial DBD plasma without direct contact with water. From the plasma emission lines, we identified the chemically active species resulting from water dissociation. The aqua pathogens tested in the experiments were of five types containing <I>Edwardsiella tarda</I>, which causes lethal diseases in aquaculture populations; the MH-DBD plasma showed high sterilization performance over 6.5–7.5 log reduction under specific conditions. Consequently, we believe that the MH-DBD plasma can be an effective water treatment tool not only to sterilize fish pathogens in aquaculture but also to decontaminate waste water through plasma-based oxidation processes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel MH-DBD plasma system was developed for pathogen sterilization in aquaculture. </LI> <LI> The eccentric electrode arrangement enhanced plasma emission toward water. </LI> <LI> The MH-DBD plasma showed high sterilization performance over 6.5–7.5 log reduction. </LI> <LI> This system can decontaminate waste water through plasma-based oxidation processes. </LI> </UL> </P>
Su Yong Kim,Kang Sup Yoon,Dong Hwal Lee,Man Hyung Lee 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, a loosely coupled integration system is proposed for improving the positioning performance of a mobile robot by fusing the Pseudolite Ultrasonic System (PUS), which is an absolute position measurement system using direct ultrasonic wave, with the odometer of Dead-Reckoning (DR). The PUS and the DR calculate position independently and a Kalman filter estimates the position using position information from the PUS and the DR. To estimate the position of the mobile robot accurately in case the LOS (line-of-sight) between ultrasonic transmitter and receiver is blocked due to obstacles, a positioning failure detection algorithm is proposed. The positioning performances of the proposed loosely coupled integrated system are verified and evaluated by experiments. The experimental results show that the position of mobile robot is estimated accurately by the proposed algorithm.
Arbekacin의 methicillin 내성 Staphylococcus aureus에 대한 항균 효과
허지영,이위교,김활웅,현봉학 대한화학요법학회 2002 대한화학요법학회지 Vol.20 No.1
목적 : Arbekacin은 일본에서 개발된 aminoglycoside 제제로 1991년 이후로 methicillin 내성 포도구균(methicillin-resistant Staphylococcus aureus, MRSA) 감염증에 대해 사용되어지고 있다. 저자들은 arbekacin의 MRSA에 대한 항균력을 평가하기 위해 2001년 3월에서 7월까지 아주대학병원 임상검체에서 분리된 MRSA 100균주에 대해 시험관내 항균력을 검사하고자 하였다. 방법 : 임상검체에서 자란 MRSA 100균주를 대상으로 디스크 확산법으로 감수성검사를 시행하고 한천희석법으로 최소발육저지농도(Minimal Inhibitory Concentration, MIC)를 측정하였으며, 항균효과를 평가하기 위하여 bactericidal effect와 post-antibiotic effect를 측정하였다. 결과 : MIC는 8㎍/mL로 측정된 2균주를 제외하고는 전부 4㎍/mL 이하였고, 디스크 확산법 검사상 arbekacin에 내성인 균주는 없었다. arbekacin은 농도에 비례하여 살균효과를 나타내었으며, post-antibiotic effect는 1.6-3.1 시간까지 지속되었다. 결론 : Arbekacin은 우수한 시험관내 항균력을 나타내어 MRSA의 감염증의 치료제로 사용할 수 있을 것으로 사료된다. Background : Arbekacin is an aminoglycoside developed in Japan and has been used since 1991 for the treatment of infections caused by methidllin-resistant Staphylococcus aureus(MRSA). The objective of this study is to determine the in vitro antimicrobial activity of arbekacin against clinical isolates of MRSA obtained from the Ajou University Hospital from March to July, 2001. Method : The minimal inhibitory concentrations(MICs) of the 100 MRSA isolates were determined by the agar dilution method and the antimicrobial susceptibility testing was performed by the disk diffusion method. The bactericidal and the post-antibiotic effects were tested. Results : Two isolates revealed MICs of 8 ㎍/mL, and the others < 4 ㎍/mL. All isolates were considered susceptible to arbekacin. Arbekacin showed concentration-dependent bactericidal activity against MRSA, and the post-antibiotic effect lasted 1.6-5.1 hours. Conclusion : These results suggest that arbekacin could provide an alternative for the treatment of MRSA.
High performance carbon nanotubes thin film transistors by selective ferric chloride doping
Park Noh-Hwal,Shin Eun Sol,Ryu Gi-Seong,Kwon Jimin,Ji Dongseob,Park Hyunjin,Kim Yun Ho,Noh Yong-Young 한국정보디스플레이학회 2023 Journal of information display Vol.24 No.2
Single wall carbon nanotubes (SWNT) have been a significant research topic as active layers for thin film transistors (TFTs) due to their high charge carrier mobility beyond that of crystalline silicon. In this study, we report an effective approach to achieve a very high field-effect mobility and on/off ratio for solution processed semiconducting SWNT TFTs, by selective doping through contact with a thin ferric chloride (FeCl3) dopant layer. The semiconducting layer is formed by a double spin coating of the highly purified (>99%) high pressure carbon mono oxide (HiPCO) SWNT sorted by wrapping of poly (3-dodecylthiophene-2,5-diyl) (P3DDT). In order to achieve effective hole injection from the top Au source electrode without increasing the off-state drain current, less purified (98-99%) SWNTs produced by the plasma discharge process sorted by wrapping of poly (9,9-di-n-dodecylfluorene) (PFDD) are formed on the top of HiPCO film. Significantly improved TFT performance is achieved by the insertion of a few nanometers of a FeCl3 dopant layer at the semiconductor-contact interface. A significant high hole field-effect of 48.35±3.11 cm2V−1s−1 (bare: 6.18±0.87 cm2V−1s−1) with a reasonable on/off current ratio of 105, and low off current of ∼80 pA, are obtained by controlling the concentration of FeCl3 dopant (thickness = 1.5 nm) at the contact. Mobility is improved further at 2.5nm thickness of the FeCl3 dopant layer resulting in a hole mobility of 177±13.2 cm2 V−1s−1, an on/off ratio of 7.4×103, and off state current of 1.2×10−9 A.
철골조 모듈러 유닛의 현장시공 보-보 결합 구조체의 3시간 내화성능에 관한 실험적 연구
장활제(Jang, Hwal-Je),송재은(Song, Jae-Eun),김양범(Kim, Yang-Bum),김경수(Kim, Kyung-Su),안용한(Ahn, Yong-Han) 대한건축학회 2024 대한건축학회논문집 Vol.40 No.2
This study aims to assess the 3-hour fire resistance capabilities of a beam-to-beam combination structure, mirroring the on-site assembly features of the modular construction method. A specific detail for the 3-hour fire resistance of the beam-to-beam combination structure was put forth, followed by a non-load heating test utilizing a horizontal heating furnace. In this proposed detail, fireproof gypsum boards cover the beams of individual modular units, the linear joint between on-site installed beams is filled with fireproof insulation or ceramic wool, and a fireproof sealant is applied for non-flammability assurance. The results from two rounds of 3-hour fireproof tests demonstrated satisfactory fireproof performance.